Gage-casing.



P. M. GELATT. GAGE CASING. APPLICATION FILED MAY 5, 1916..

Paten' ted Jan. 8, 1918.

PAT @FFTQE.

GAGE-CASING.

Specification of Letters Patent.

Patented Jan. 8, 1918.

Application filed May 5, 1916. Serial No. 95,559.

To all whom it may concern:

Be it known that I, PHILO M. GELATT, a citizen of the United States of America, residing at La Crosse, in the county of La Crosse and State of \Visconsin, have invented certain new and useful Improvements in Gage-Casing, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a casing for pressure gages or the like that presents a dust tight exterior, that is not capable of being opened by ordinary means, so that the contents cannot be readily tampered with, while dust proof joints are provided without the use of gaskets of materials which deteriorate, provision however, being made to avoid any vibration that causes rapping or like annoyances. Y

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claim.

In the drawings,

Figure 1 is a view in section of a casing that embodies features of the invention with the observation plate or cover and its holding ring drawn out but in position for assembling, the device being shown as mounted in the cowl or dash of an automobile;

Ijig. 2 is a plan view of the assembled casing;

Fig. 3 is a view in detail and in section, and

Fig. 4 is a greatly enlarged view showing the method of securing the observation plate in position and providing for a packless, dust proof and noiseless joint.

As herein shown, a cylindrical casing 1 is formed or pressed out of sheet metal with an annular face flange 2 whereby it may be secured in an opening in the support afforded for it. The base of the casing has openings indicated at 4 and 5 for the connections with whatever mechanism is inserted or carried in the casing.

A collar 6 is formed of sheet metal to frictionally engage in the mouth of the casing 1, the outer portion of the collar being outturned and reverted to form a beaded flange 7 with an inwardly projecting portion, the margin 8 of which is slightly inturned as indicated in Fig. 4. An observation plate 9 is inserted in the collar and is forced against the inturned marginal portion 8 thereof, by a split ring 10 that tends to expand against the wall of the collar and bears against the oblique sides of projections 11 depressed at intervals into the body of the collar. As a consequence, the ring 10 crowds the glass against the yielding margin 8 of the flange and prevents any chattering or vibration while at the same time a substantially air tight and dust proof joint is obtained. It is to be understood that in the figures the gage of the metal has been increased disproportionately with the size of the casing, for clear view, and that the flange 7 presents a smooth exterior when against the flange 2 that prevents the ready insertion of any tool, especially if the parts are buffed or polished after assembly.

As a result of this construction, a casing for the purposes stated is obtained that is substantially inaccessible for persons not having tools especially fitted for opening it, and when the casing is mounted in position the interior cannot be reached by the removal of screws or like holding means, such as are found in devices of this character of ordinary type. Furthermore the resilient support afforded the observation plate prevents any singing or vibrating and thereby avoids annoyances common in devices of this character while all packing that is liable to deteriorate is avoided.

Obviously, changes in the details of construction mav be made without departing from the spirit of my invention and I do not care to limit myself to any particular form or arrangement of parts.

WVhat I claim is A gage casing comprising a cylindrical sheet metal body having a base and peripheral wall integral therewith, the outer marginal portion of which is outturned as an annular flange, a collar frictionally engaging into the mouth of the body with the outer marginal portion thereof outturned to form a flange adapted to abut the body flange and reverted on itself and extended inwardly to form an inner annular flange or retaining shoulder, the margin of the inner flange being beveled and slightly down bent to form a resilient edge, a series of indentations in the collar below this flange roviding upwardly oblique cam faces, an o servation plate between the indentations and the In testimony whereof I afiix my signature resilient edged flange, and a split expansion in the presence of two Witnesses.

ring between the pro ections and the plate PHILO M. GELATT. riding on the camming surfaces and forcing Witnesses: '5 the plate yieldingly against the resilient edge J. M. LA VAQUE,

of the shoulder. HARRY JOHNSON. 

